<?php
defined('BASE') or exit('Access Denied!'); 

/**
 * Obullo Framework (c) 2009.
 *
 * PHP5 MVC Based Minimalist Software.
 * 
 * @package         obullo       
 * @author          obullo.com
 * @copyright       Ersin Guvenc (c) 2009.
 * @license         public
 * @since           Version 1.0
 * @filesource
 * @license
 */

// ------------------------------------------------------------------------

/**
 * Obullo Date Helpers
 *
 * @package     Obullo
 * @subpackage  Helpers
 * @category    Helpers
 * @author      Ersin Guvenc
 * @link        
 */

// ------------------------------------------------------------------------

/**
* Get "now" time
*
* Returns time() or its GMT equivalent based on the config file preference
*
* @access	public
* @return	integer
*/
if( ! function_exists('now') ) 
{
    function now()
    {
	    if (strtolower(config_item('time_reference')) == 'gmt')
	    {
		    $now = time();
		    $system_time = mktime(
                                    gmdate("H", $now), 
                                    gmdate("i", $now), 
                                    gmdate("s", $now), 
                                    gmdate("m", $now), 
                                    gmdate("d", $now), 
                                    gmdate("Y", $now));

		    if (strlen($system_time) < 10)
		    {
			    $system_time = time();
			    
                log_message('error', 'The Date class could not set a proper GMT timestamp so the local time() value was used.');
		    }    

		    return $system_time;
	    }
	    else
	    {
		    return time();
	    }
    }
}
	
// ------------------------------------------------------------------------

/**
* Convert MySQL Style Datecodes
*
* This function is identical to PHPs date() function,
* except that it allows date codes to be formatted using
* the MySQL style, where each code letter is preceded
* with a percent sign:  %Y %m %d etc...
*
* The benefit of doing dates this way is that you don't
* have to worry about escaping your text letters that
* match the date codes.
*
* @access	public
* @param	string
* @param	integer
* @return	integer
*/
if( ! function_exists('mdate') ) 
{
    function mdate($datestr = '', $time = '')
    {
	    if ($datestr == '')
		    return '';

	    if ($time == '')
		    $time = now();
	    
	    $datestr = str_replace('%\\', '', preg_replace("/([a-z]+?){1}/i", "\\\\\\1", $datestr));
	    return date($datestr, $time);
    }
}
	
// ------------------------------------------------------------------------

/**
* Standard Date
*
* Returns a date formatted according to the submitted standard.
*
* @access	public
* @param	string	the chosen format
* @param	integer	Unix timestamp
* @return	string
*/
if( ! function_exists('standart_date') ) 
{
    function standard_date($fmt = 'DATE_RFC822', $time = '')
    {
	    $formats = array(
					    'DATE_ATOM'		=>	'%Y-%m-%dT%H:%i:%s%Q',
					    'DATE_COOKIE'	=>	'%l, %d-%M-%y %H:%i:%s UTC',
					    'DATE_ISO8601'	=>	'%Y-%m-%dT%H:%i:%s%O',
					    'DATE_RFC822'	=>	'%D, %d %M %y %H:%i:%s %O',
					    'DATE_RFC850'	=>	'%l, %d-%M-%y %H:%m:%i UTC',
					    'DATE_RFC1036'	=>	'%D, %d %M %y %H:%i:%s %O',
					    'DATE_RFC1123'	=>	'%D, %d %M %Y %H:%i:%s %O',
					    'DATE_RSS'		=>	'%D, %d %M %Y %H:%i:%s %O',
					    'DATE_W3C'		=>	'%Y-%m-%dT%H:%i:%s%Q'
					    );

	    if ( ! isset($formats[$fmt]))
	    {
		    return FALSE;
	    }

	    return mdate($formats[$fmt], $time);
    }
}

// ------------------------------------------------------------------------

/**
* Timespan
*
* Returns a span of seconds in this format:
*	10 days 14 hours 36 minutes 47 seconds
*
* @access	public
* @param	integer	a number of seconds
* @param	integer	Unix timestamp
* @return	integer
*/
if( ! function_exists('timespan') ) 
{
    function timespan($seconds = 1, $time = '')
    {
        lang_load('date');

	    if ( ! is_numeric($seconds))
	    {
		    $seconds = 1;
	    }

	    if ( ! is_numeric($time))
	    {
		    $time = time();
	    }

	    if ($time <= $seconds)
	    {
		    $seconds = 1;
	    }
	    else
	    {
		    $seconds = $time - $seconds;
	    }
	    
	    $str = '';
	    $years = floor($seconds / 31536000);

	    if ($years > 0)
	    {	
		    $str .= $years.' '.$OB->lang->line((($years	> 1) ? 'date_years' : 'date_year')).', ';
	    }	

	    $seconds -= $years * 31536000;
	    $months = floor($seconds / 2628000);

	    if ($years > 0 OR $months > 0)
	    {
		    if ($months > 0)
		    {	
			    $str .= $months.' '.lang((($months	> 1) ? 'date_months' : 'date_month')).', ';
		    }	

		    $seconds -= $months * 2628000;
	    }

	    $weeks = floor($seconds / 604800);

	    if ($years > 0 OR $months > 0 OR $weeks > 0)
	    {
		    if ($weeks > 0)
		    {	
			    $str .= $weeks.' '.lang((($weeks	> 1) ? 'date_weeks' : 'date_week')).', ';
		    }
	    
		    $seconds -= $weeks * 604800;
	    }			

	    $days = floor($seconds / 86400);

	    if ($months > 0 OR $weeks > 0 OR $days > 0)
	    {
		    if ($days > 0)
		    {	
			    $str .= $days.' '.lang((($days	> 1) ? 'date_days' : 'date_day')).', ';
		    }

		    $seconds -= $days * 86400;
	    }

	    $hours = floor($seconds / 3600);

	    if ($days > 0 OR $hours > 0)
	    {
		    if ($hours > 0)
		    {
			    $str .= $hours.' '.lang((($hours	> 1) ? 'date_hours' : 'date_hour')).', ';
		    }
	    
		    $seconds -= $hours * 3600;
	    }

	    $minutes = floor($seconds / 60);

	    if ($days > 0 OR $hours > 0 OR $minutes > 0)
	    {
		    if ($minutes > 0)
		    {	
			    $str .= $minutes.' '.lang((($minutes	> 1) ? 'date_minutes' : 'date_minute')).', ';
		    }
	    
		    $seconds -= $minutes * 60;
	    }

	    if ($str == '')
	    {
		    $str .= $seconds.' '.lang((($seconds	> 1) ? 'date_seconds' : 'date_second')).', ';
	    }
		    
	    return substr(trim($str), 0, -1);
    }
}
	
// ------------------------------------------------------------------------

/**
* Number of days in a month
*
* Takes a month/year as input and returns the number of days
* for the given month/year. Takes leap years into consideration.
*
* @access	public
* @param	integer a numeric month
* @param	integer	a numeric year
* @return	integer
*/
if( ! function_exists('days_in_month') ) 
{
    function days_in_month($month = 0, $year = '')
    {
	    if ($month < 1 OR $month > 12)
	    {
		    return 0;
	    }

	    if ( ! is_numeric($year) OR strlen($year) != 4)
	    {
		    $year = date('Y');
	    }

	    if ($month == 2)
	    {
		    if ($year % 400 == 0 OR ($year % 4 == 0 AND $year % 100 != 0))
		    {
			    return 29;
		    }
	    }

	    $days_in_month	= array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
	    return $days_in_month[$month - 1];
    }
}
	
// ------------------------------------------------------------------------

/**
* Converts a local Unix timestamp to GMT
*
* @access	public
* @param	integer Unix timestamp
* @return	integer
*/	
if( ! function_exists('local_to_gmt') ) 
{
    function local_to_gmt($time = '')
    {
	    if ($time == '')
		    $time = time();

	    return mktime( 
                        gmdate("H", $time), 
                        gmdate("i", $time), 
                        gmdate("s", $time), 
                        gmdate("m", $time), 
                        gmdate("d", $time), 
                        gmdate("Y", $time));
    }
}
    
// ------------------------------------------------------------------------

/**
* Converts GMT time to a localized value
*
* Takes a Unix timestamp (in GMT) as input, and returns
* at the local value based on the timezone and DST setting
* submitted
*
* @access	public
* @param	integer Unix timestamp
* @param	string	timezone
* @param	bool	whether DST is active
* @return	integer
*/
if( ! function_exists('gmt_to_local') ) 
{
    function gmt_to_local($time = '', $timezone = 'UTC', $dst = FALSE)
    {			
	    if ($time == '')
	    {
		    return now();
	    }
    
	    $time += timezones($timezone) * 3600;

	    if ($dst == TRUE)
	    {
		    $time += 3600;
	    }

	    return $time;
    }
}
	
// ------------------------------------------------------------------------

/**
* Converts a MySQL Timestamp to Unix
*
* @access	public
* @param	integer Unix timestamp
* @return	integer
*/	
if( ! function_exists('mysql_to_unix') ) 
{
    function mysql_to_unix($time = '')
    {
	    // We'll remove certain characters for backward compatibility
	    // since the formatting changed with MySQL 4.1
	    // YYYY-MM-DD HH:MM:SS

	    $time = str_replace('-', '', $time);
	    $time = str_replace(':', '', $time);
	    $time = str_replace(' ', '', $time);

	    // YYYYMMDDHHMMSS
	    return  mktime(
					    substr($time, 8, 2),
					    substr($time, 10, 2),
					    substr($time, 12, 2),
					    substr($time, 4, 2),
					    substr($time, 6, 2),
					    substr($time, 0, 4)
					    );
    }
}
	
// ------------------------------------------------------------------------

/**
* Unix to "Human"
*
* Formats Unix timestamp to the following prototype: 2006-08-21 11:35 PM
*
* @access	public
* @param	integer Unix timestamp
* @param	bool	whether to show seconds
* @param	string	format: us or euro
* @return	string
*/
if( ! function_exists('unix_to_human') ) 
{	
    function unix_to_human($time = '', $seconds = FALSE, $fmt = 'us')
    {
	    $r  = date('Y', $time).'-'.date('m', $time).'-'.date('d', $time).' ';
	    
	    if ($fmt == 'us')
	    {
		    $r .= date('h', $time).':'.date('i', $time);
	    }
	    else
	    {
		    $r .= date('H', $time).':'.date('i', $time);
	    }

	    if ($seconds)
	    {
		    $r .= ':'.date('s', $time);
	    }

	    if ($fmt == 'us')
	    {
		    $r .= ' '.date('A', $time);
	    }
	    
	    return $r;
    }
}   
// ------------------------------------------------------------------------

/**
* Convert "human" date to GMT
*
* Reverses the above process
*
* @access	public
* @param	string	format: us or euro
* @return	integer
*/
if( ! function_exists('human_to_unix') ) 
{
    function human_to_unix($datestr = '')
    {
	    if ($datestr == '')
	    {
		    return FALSE;
	    }

	    $datestr = trim($datestr);
	    $datestr = preg_replace("/\040+/", ' ', $datestr);

	    if ( ! preg_match('/^[0-9]{2,4}\-[0-9]{1,2}\-[0-9]{1,2}\s[0-9]{1,2}:[0-9]{1,2}(?::[0-9]{1,2})?(?:\s[AP]M)?$/i', $datestr))
	    {
		    return FALSE;
	    }

        $split = explode(' ', $datestr);

	    $ex = explode("-", $split['0']);

	    $year  = (strlen($ex['0']) == 2) ? '20'.$ex['0'] : $ex['0'];
	    $month = (strlen($ex['1']) == 1) ? '0'.$ex['1']  : $ex['1'];
	    $day   = (strlen($ex['2']) == 1) ? '0'.$ex['2']  : $ex['2'];

	    $ex = explode(":", $split['1']);

	    $hour = (strlen($ex['0']) == 1) ? '0'.$ex['0'] : $ex['0'];
	    $min  = (strlen($ex['1']) == 1) ? '0'.$ex['1'] : $ex['1'];

	    if (isset($ex['2']) && preg_match('/[0-9]{1,2}/', $ex['2']))
	    {
		    $sec  = (strlen($ex['2']) == 1) ? '0'.$ex['2'] : $ex['2'];
	    }
	    else
	    {
		    // Unless specified, seconds get set to zero.
		    $sec = '00';
	    }

	    if (isset($split['2']))
	    {
		    $ampm = strtolower($split['2']);
	    
		    if (substr($ampm, 0, 1) == 'p' AND $hour < 12)
			    $hour = $hour + 12;
		    
		    if (substr($ampm, 0, 1) == 'a' AND $hour == 12)
			    $hour =  '00';
		    
		    if (strlen($hour) == 1)
			    $hour = '0'.$hour;
	    }
		    
	    return mktime($hour, $min, $sec, $month, $day, $year);
    }
}
	
// ------------------------------------------------------------------------

/**
* Timezone Menu
*
* Generates a drop-down menu of timezones.
*
* @access	public
* @param	string	timezone
* @param	string	classname
* @param	string	menu name
* @return	string
*/	
if( ! function_exists('timezone_menu') ) 
{
    function timezone_menu($default = 'UTC', $class = "", $name = 'timezones')
    {
	    lang_load('date');

	    if ($default == 'GMT')
		    $default = 'UTC';

	    $menu = '<select name="'.$name.'"';

	    if ($class != '')
	    {
		    $menu .= ' class="'.$class.'"';
	    }

	    $menu .= ">\n";

	    foreach (timezones() as $key => $val)
	    {
		    $selected = ($default == $key) ? " selected='selected'" : '';
		    $menu .= "<option value='{$key}'{$selected}>".lang($key)."</option>\n";
	    }

	    $menu .= "</select>";

	    return $menu;
    }
}
	
// ------------------------------------------------------------------------

/**
* Timezones
*
* Returns an array of timezones.  This is a helper function
* for various other ones in this library
*
* @access	public
* @param	string	timezone
* @return	string
*/
if( ! function_exists('timezones') ) 
{
    function timezones($tz = '')
    {
	    // Note: Don't change the order of these even though
	    // some items appear to be in the wrong order
	    
	    $zones = array( 
					    'UM12'		=> -12,
					    'UM11'		=> -11,
					    'UM10'		=> -10,
					    'UM95'		=> -9.5,
					    'UM9'		=> -9,
					    'UM8'		=> -8,
					    'UM7'		=> -7,
					    'UM6'		=> -6,
					    'UM5'		=> -5,
					    'UM45'		=> -4.5,
					    'UM4'		=> -4,
					    'UM35'		=> -3.5,
					    'UM3'		=> -3,
					    'UM2'		=> -2,
					    'UM1'		=> -1,
					    'UTC'		=> 0,
					    'UP1'		=> +1,
					    'UP2'		=> +2,
					    'UP3'		=> +3,
					    'UP35'		=> +3.5,
					    'UP4'		=> +4,
					    'UP45'		=> +4.5,
					    'UP5'		=> +5,
					    'UP55'		=> +5.5,
					    'UP575'		=> +5.75,
					    'UP6'		=> +6,
					    'UP65'		=> +6.5,
					    'UP7'		=> +7,
					    'UP8'		=> +8,
					    'UP875'		=> +8.75,
					    'UP9'		=> +9,
					    'UP95'		=> +9.5,
					    'UP10'		=> +10,
					    'UP105'		=> +10.5,
					    'UP11'		=> +11,
					    'UP115'		=> +11.5,
					    'UP12'		=> +12,
					    'UP1275'	=> +12.75,
					    'UP13'		=> +13,
					    'UP14'		=> +14
				    );
			    
	    if ($tz == '')
	    {
		    return $zones;
	    }

	    if ($tz == 'GMT')
		    $tz = 'UTC';

	    return ( ! isset($zones[$tz])) ? 0 : $zones[$tz];
    }
}

/* End of file date.php */
/* Location: ./base/helpers/date.php */